It's probably your line and nothing to do with sky. My line only allows 1Mb so I took the cheapest broadband possible until fibreoptic became available.
If you are with BT then give them a call to do a line check and see what speeds your line is capable of
Bought this as a spare but needing to now free some cash up as the gf's car has just gone into garage and needs 4 new tyres, new exhaust and new suspension!
I'd be looking at something like £70 delivered but offers considered.
Edit: thanks mr mod!